diff --git a/eclipse.platform.ui/bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/internal/themes/RGBVisibleContrastColorFactory.java b/eclipse.platform.ui/bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/internal/themes/RGBVisibleContrastColorFactory.java
new file mode 100644
index 0000000..67b33c7
--- /dev/null
+++ b/eclipse.platform.ui/bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/internal/themes/RGBVisibleContrastColorFactory.java
@@ -0,0 +1,106 @@
+/*******************************************************************************
+ * Copyright (c) 2004, 2011 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.ui.internal.themes;
+
+import java.util.Hashtable;
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IConfigurationElement;
+import org.eclipse.core.runtime.IExecutableExtension;
+import org.eclipse.swt.graphics.RGB;
+import org.eclipse.ui.themes.ColorUtil;
+import org.eclipse.ui.themes.IColorFactory;
+
+/**
+ * A <code>IColorFactory</code> that may be used to select a color with a higher
+ * contrast. The input colors are specified as per method number two in
+ * {@link org.eclipse.core.runtime.IExecutableExtension}.
+ * <p>
+ * Example usage:
+ *
+ * <pre>
+ * <colorDefinition
+ * label="Declaration view background"
+ * id="org.eclipse.jdt.ui.DeclarationView.backgroundColor">
+ * <colorFactory
+ * plugin="org.eclipse.ui"
+ * class="org.eclipse.ui.internal.themes.RGBContrastFactory">
+ * <parameter name="foreground" value="0,0,0" />
+ * <parameter name="background" value="COLOR_INFO_BACKGROUND" />
+ * <parameter name="alternativeBackground" value="COLOR_LIST_BACKGROUND" />
+ * </colorFactory>
+ * </colorDefinition>
+ * </pre>
+ *
+ * <p>
+ * Returns <em>background</em> if <em>foreground</em> is visibly distinct from
+ * <em>background</em>. Otherwise, returns <em>alternativeBackground</em> if
+ * that color has more difference in brightness to the foreground. If both
+ * colors are bad, returns <em>background</em>. The color values may be
+ * specified as RGB triples or as SWT constants.
+ *
+ * @see org.eclipse.swt.SWT
+ * @since 3.107.100
+ */
+// This class is used by org.eclipse.jdt.ui/plugin.xml to fix
+// https://bugs.eclipse.org/477487
+public class RGBVisibleContrastColorFactory implements IColorFactory, IExecutableExtension {
+ private String fg, bg, altBg;
+
+ @Override
+ public RGB createColor() {
+ RGB cfg, cbg, cbgAlt;
+
+ if (fg != null) {
+ cfg = ColorUtil.getColorValue(fg);
+ } else {
+ cfg = new RGB(0, 0, 0);
+ }
+ if (bg != null) {
+ cbg = ColorUtil.getColorValue(bg);
+ } else {
+ cbg = new RGB(255, 255, 255);
+ }
+ if (altBg != null) {
+ cbgAlt = ColorUtil.getColorValue(altBg);
+ } else {
+ cbgAlt = new RGB(255, 255, 255);
+ }
+
+ float bfg = cfg.getHSB()[2];
+ float bbg = cbg.getHSB()[2];
+ float bbgAlt = cbgAlt.getHSB()[2];
+
+ if (Math.abs(bbg - bfg) < 0.5f && Math.abs(bbgAlt - bfg) > Math.abs(bbg - bfg)) {
+ return cbgAlt;
+ }
+ return cbg;
+ }
+
+ /**
+ * This executable extension requires parameters to be explicitly declared
+ * via the second method described in the <code>IExecutableExtension</code>
+ * documentation. This class expects that there will be three parameters,
+ * <code>foreground</code>, <code>background</code> and
+ * <code>alternativeBackground</code>. These values may either be RGB
+ * triples or SWT constants.
+ */
+ @Override
+ public void setInitializationData(IConfigurationElement config, String propertyName, Object data)
+ throws CoreException {
+ if (data instanceof Hashtable) {
+ @SuppressWarnings("unchecked")
+ Hashtable<String, String> table = (Hashtable<String, String>) data;
+ fg = table.get("foreground"); //$NON-NLS-1$
+ bg = table.get("background"); //$NON-NLS-1$
+ altBg = table.get("alternativeBackground"); //$NON-NLS-1$
+ }
+ }
+}
diff --git a/eclipse.jdt.ui/org.eclipse.jdt.ui/plugin.xml b/org.eclipse.jdt.ui/plugin.xml
index e266d1a..f4b51ed 100644
--- a/eclipse.jdt.ui/org.eclipse.jdt.ui/plugin.xml
+++ b/eclipse.jdt.ui/org.eclipse.jdt.ui/plugin.xml
@@ -1065,8 +1065,23 @@
<colorDefinition
label="%DeclarationViewBackgroundColor.label"
categoryId="org.eclipse.jdt.ui.presentation"
- value="COLOR_INFO_BACKGROUND"
id="org.eclipse.jdt.ui.DeclarationView.backgroundColor">
+ <colorFactory
+ plugin="org.eclipse.ui"
+ class="org.eclipse.ui.internal.themes.RGBVisibleContrastColorFactory">
+ <parameter
+ name="foreground"
+ value="0,0,0">
+ </parameter>
+ <parameter
+ name="background"
+ value="COLOR_INFO_BACKGROUND">
+ </parameter>
+ <parameter
+ name="alternativeBackground"
+ value="COLOR_LIST_BACKGROUND">
+ </parameter>
+ </colorFactory>
<description>
%DeclarationViewBackgroundColor.description
</description>
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